class Chengji {
    public static void main(String[] args) {
        switch(score){
			case 9:
				System.out.println("A");
				break;
			case 8:
			case 7:
				System.out.println("B");
				break;
			case 6:
				System.out.println("C");
				break;
			case 5:
			case 4:
			case 3:
			case 2:
			case 1:
				System.out.println("D");
				break;
	    }
		int a = 3;
		int b = 100;
		switch (a){
			case 1:
				b+= 5;
				break;
			case 2 :
				b+=10;
				break;
			case 3 :
				b+=16;
				break;
			default :
				b+=34;
				break;
		}
    }
} 